Rajneesh Noonia

Page flip with deep zoom

Rajneesh Noonia — Wed, 29 Jun 2011 00:38:15 +0000

Book control is another excellent page flip control which allows you to add any silverlight element as book page.It supports page down and page up as bidiretional navigation keys.Demo application & source code is attached below.

The objective of this article is to create photo album application which allows user to add pictures just by drag and drop on album.The picture will be splitted into parts and uploaded on server where it is re-constructed and again processed into deep zoom meta file (on fly) and link to this picture will be then added into album.Photo album will have deep zoom enabled pages.

I couldn’t get much time to finish this project & hence i would call this as beta source code which includes the full source code of Book control (page flip)

Beta Source code for book control is available here

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@@servername

Rajneesh Noonia — Tue, 28 Jun 2011 23:07:11 +0000

If @@servername returns null or return wrong host name, execute below mentioned sql Query.

DECLARE @Current SysName
Select @Current = Convert(varchar(128), SERVERPROPERTY(‘ServerName’) )
IF(@Current <> @@SERVERNAME)
BEGIN
EXEC sp_dropserver @@SERVERNAME
EXEC sp_addserver @server=@Current,@local = ‘local’
EXEC master..xp_cmdshell ‘ECHO NET STOP MSSQLSERVER > restartSQL.bat’, no_output
EXEC master..xp_cmdshell ‘ECHO NET START MSSQLSERVER >> restartSQL.bat’, no_output
EXEC master..xp_cmdshell ‘restartSQL.bat’, no_output
–Connection with sql break here
END

– Check if every thing is correct
SELECT @@Servername
SELECT SERVERPROPERTY(‘ServerName’)

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Export data from corrupted database

Rajneesh Noonia — Thu, 12 May 2011 09:10:25 +0000

Below is the sql script to import data from source database into target database, It is assumed that you have both the databases on single server.The source database is current database & few tables are corrupted whereas the traget database is created from old backup for target database.since their is corruption ,it is not possible to take backup of current database. This script imports back data (only) from source to target database. You need to only replace 3 lines of the script (12th line from bottom).
Download script from here

————- Create helper functions —————————–

IF EXISTS (SELECT * FROM dbo.sysobjects WHERE id = object_id(N‘[dbo].[Mig_ImportTable]‘) AND OBJECTPROPERTY(id, N‘IsProcedure’) = 1)
DROP PROCEDURE [dbo].[Mig_ImportTable]
GO

CREATE PROC dbo.Mig_ImportTable @DATABASE SYSNAME, @TABLE SYSNAME AS
SET NOCOUNT ON

DECLARE @COLUMN SYSNAME
DECLARE @SQL NVARCHAR(4000)
DECLARE @colSQL NVARCHAR(4000)
DECLARE @IsIdentity BIT
DECLARE @IsTableIdentity BIT

SET @colSQL = ”
SET @SQL=”
SET @IsTableIdentity = 0 –false
SET @IsIdentity = 0 –false

PRINT ‘Table Migration Started for :’ + @TABLE + ‘ in ‘ + @DATABASE

DECLARE curMoveDown CURSOR
LOCAL FORWARD_ONLY
OPTIMISTIC FOR
SELECT column_name,COLUMNPROPERTY(object_id(TABLE_NAME), COLUMN_NAME, ‘IsIdentity’)AS IsIdentity FROM information_schema.COLUMNS
WHERE UPPER(table_name ) = UPPER(@TABLE)

OPEN curMoveDown FETCH NEXT FROM curMoveDown INTO @COLUMN,@IsIdentity
WHILE @@FETCH_STATUS = 0
BEGIN
SET @colSQL = @colSQL + ‘[' + @COLUMN + '],’
SET @IsTableIdentity = @IsTableIdentity | @IsIdentity
IF (@IsTableIdentity = 1) BREAK
FETCH NEXT FROM curMoveDown INTO @COLUMN,@IsIdentity
END
CLOSE curMoveDown
DEALLOCATE curMoveDown

IF(LEN(@colSQL)>1)
BEGIN
SET @colSQL = LEFT(@colSQL,LEN(@colSQL) – 1)

IF(@IsTableIdentity = 1) SET @SQL = @SQL + ‘SET IDENTITY_INSERT ‘ + @TABLE + ‘ ON ‘
SET @SQL = @SQL + ‘ ALTER TABLE ‘ + @TABLE + ‘ DISABLE TRIGGER ALL ‘
SET @SQL = @SQL + ‘ ALTER TABLE ‘ + @TABLE + ‘ NOCHECK CONSTRAINT ALL ‘
SET @SQL = @SQL + ‘ TRUNCATE TABLE ‘ + @TABLE + ‘ ’
IF(@IsTableIdentity = 1)
SET @SQL = @SQL + ‘ INSERT INTO ‘ + @TABLE + ‘ (‘ + @colSQL + ‘) SELECT ‘+ @colSQL + ‘ FROM ‘ + ‘[' + @DATABASE + '].[dbo].[' + @TABLE + '] ‘
ELSE
SET @SQL = @SQL + ‘ INSERT INTO ‘ + @TABLE + ‘ SELECT * FROM ‘ + ‘[' + @DATABASE + '].[dbo].[' + @TABLE + '] ‘
IF(@IsTableIdentity = 1) SET @SQL = @SQL + ‘ SET IDENTITY_INSERT ‘ + @TABLE + ‘ OFF ‘
SET @SQL = @SQL + ‘ ALTER TABLE ‘ + @TABLE + ‘ ENABLE TRIGGER ALL ‘
SET @SQL = @SQL + ‘ ALTER TABLE ‘ + @TABLE + ‘ CHECK CONSTRAINT ALL ‘

EXEC sp_executesql @SQL
PRINT ‘Table migrated :’ + @TABLE
END
ELSE
PRINT ‘No Column found :’ + @TABLE + ‘ (SQL = ‘ + @colSQL + ‘)’

PRINT ‘Table Migration finished for :’ + @TABLE
GO

IF EXISTS (SELECT * FROM dbo.sysobjects WHERE id = object_id(N‘[dbo].[Mig_ImportDatabase]‘) AND OBJECTPROPERTY(id, N‘IsProcedure’) = 1)
DROP PROCEDURE [dbo].[Mig_ImportDatabase]
GO

CREATE PROC dbo.Mig_ImportDatabase @Source SYSNAME AS

DECLARE @SERVER SYSNAME
DECLARE @INSTANCE SYSNAME
DECLARE @FULLNAME SYSNAME
DECLARE @DBNAME SYSNAME
DECLARE @cmd varchar(1000)
DECLARE @SQL Nvarchar(1000)
DECLARE @TABLE Nvarchar(100)
DECLARE @Result INT

SET NOCOUNT ON

CREATE TABLE [#Mig_FailedTables] ( [name] SYSNAME NOT NULL ) ON [PRIMARY]

SELECT @SERVER = CONVERT(SYSNAME, SERVERPROPERTY(‘servername’))
SELECT @INSTANCE = IsNull(”,CONVERT(SYSNAME, SERVERPROPERTY(‘InstanceName’)))
SELECT @DBNAME = DB_NAME()

IF(Len(@INSTANCE)>0) SET @FULLNAME = @SERVER + ‘\’ + @INSTANCE
ELSE SET @FULLNAME = @SERVER

Print ‘Migration started FROM DATABASE [‘ + @SOURCE + ‘] TO DATABASE [‘ + @DBNAME + ‘] ON server ‘ + @FULLNAME

–Cursor to loop throw all tables of Target database (current database)
DECLARE CurTables CURSOR LOCAL FORWARD_ONLY
OPTIMISTIC FOR
SELECT NAME from dbo.sysobjects where OBJECTPROPERTY(id, N’IsUserTable‘) = 1 order by Name

OPEN CurTables FETCH NEXT FROM CurTables INTO @Table
WHILE @@FETCH_STATUS = 0
BEGIN
Print ‘Migrating TABLE ‘ + @Table
SET @cmd = ‘ECHO Exec [Mig_ImportTable] ”‘ + @Source + ‘”,”‘ + @Table + ‘” > DbMig.sql‘
EXEC @Result = master..xp_cmdshell @cmd, no_output

SET @cmd = ‘ECHO GO >> DbMig.sql‘
EXEC @Result = master..xp_cmdshell @cmd, no_output

SET @cmd = ‘ECHO @ECHO OFF > DbMig.cmd‘
EXEC @Result = master..xp_cmdshell @cmd, no_output

SET @cmd = ‘ECHO osql -E -b -S "’ + @FULLNAME +’" -d "’ + @DBNAME +’" -i "DbMig.sql" >> DbMig.cmd‘
EXEC @Result = master..xp_cmdshell @cmd, no_output

SET @cmd = ‘ECHO EXIT ERRORLEVEL >> DbMig.cmd‘
EXEC @Result = master..xp_cmdshell @cmd, no_output

SET @cmd = ‘CMD /c "DbMig.cmd>>DbMig.Log"‘
EXEC @Result = master..xp_cmdshell @cmd, no_output
IF (@Result <> 0)
Insert into #Mig_FailedTables (Name) values (@Table)
FETCH NEXT FROM CurTables INTO @Table

END
CLOSE CurTables
DEALLOCATE CurTables
Print ‘Migration Finished..‘
SELECT Name as [Failed Tables] FROM #Mig_FailedTables
DROP TABLE #Mig_FailedTables

————- Migration of data starts from here ——————

———————————————————————————————————————————-

USE TargetDatabase — Target Database    ** Change This
Exec Mig_ImportDatabase ‘SourceDatabase‘ — Source Database    ** Change This – Import Complete database
EXEC Mig_ImportTable ‘SourceDatabase‘,’SpecificTableName‘ – SpecificTableName    ** Change This – Import Single Table
———————————————————————————————————————————-

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Compare DB – record counts

Rajneesh Noonia — Fri, 22 Apr 2011 09:09:20 +0000

Code snippet will loop through all tables of Database SOURCEDB and compare record counts with tables in TARGETDB database

USE SOURCEDB

EXEC SP_MSforeachtable ‘DECLARE @OriCount INT
     DECLARE @Count INT
     DECLARE @Name VARCHAR(400)
     SET @Count = (SELECT COUNT(*) FROM TARGETDB.?)
     SET @OriCount = (SELECT COUNT(*) FROM SOURCEDB.?)
     SET @Name=”?”

IF(@Count <> @OriCount)
BEGIN
SELECT @Name,@Count as target,@OriCount as source

END‘

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Xap Loader Splash Screen

Rajneesh Noonia — Wed, 26 Jan 2011 21:53:17 +0000

The objective of this article is to create custom xap loader screen without any background image and code behind (pure XAML).In the final application version, download progress of root xap file will be shown in the sample screen above..

Will write more on this article in next few days …

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Silverlight for Symbian S60 devices

Rajneesh Noonia — Tue, 25 Jan 2011 09:57:31 +0000

Microsoft has released Silverlight platform design to work with Symbian S60 devices at the on MIX10 conference at Las Vegas.The plateform is now available for Nokia SymbianOS (S60 5th Edition) devices i.e. Nokia 5235, 5800 XpressMusic, Nokia N97 and Nokia N97 Mini Mobiles. I did some basic test with nokia 5235 and it runs with charm.

The current Silverlight beta for Symbian comes in two forms – one as an installer for Symbian (S60 5th edition) devices and the second one in the form of a developer tools suite for developing Silverlight applications for Symbian devices including emulator etc.

Silverlight includes a Runtime that is optimized to display content on memory-constrained devices.

The ability to view Silverlight applications in the mobile browser.
Tools to build Silverlight applications that target devices

Microsoft has bought the Silverlight platform to a non-Microsoft mobile platform for the first time ever.

In order to get started with Silverlight for Symbian, you will want to familiarize yourself with the platform capabilities.

More resources are available on microsoft website.

Days are not far when you will see silverlight on rest of consumer devices ..

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Silverlight TextBox AutoComit Behaviour

Rajneesh Noonia — Wed, 19 Jan 2011 00:49:11 +0000

Standard Silverlight TextBox control is very useful but has one strange behavior: if you use TwoWay data binding and bind some property to controls Text property, when users type text into the control, this change is not propagated to the bound property until the control loses its focus.

This can be very annoying if you have MVVM application and you have some kind of real-time filter that needs to update some data as-you-type.

In TwoWay bindings, changes to the target automatically update the source, except when binding to the Text property of a TextBox. In this case, the update occurs when the TextBox loses focus (in case of element to element binding the text box behaviour is normal) .

You can disable automatic source updates and update the source at times of your choosing. For example, you can do this to validate user input from multiple controls before you update the bound data sources.

You must update the source for each binding individually, however. To update a binding, first call the FrameworkElement.GetBindingExpression method of a target element, passing in the target DependencyProperty. You can then use the return value to call the BindingExpression.UpdateSource method. The following example code demonstrates this process

Problem is that TextBox control does not call BindingExpression.UpdateSource when its Text property is changed so we have to do that manually in order to fix this issue.The AutoComit Behavior for textbox control is now part of NanoVMSupport Library (Lib for MVVM)

public class AutoCommit : Behavior
{
    protected override void OnAttached()
    {
        base.OnAttached();
        AssociatedObject.TextChanged += AssociatedObjectOnTextChanged;
    }

    private void AssociatedObjectOnTextChanged(object sender, TextChangedEventArgs args)
    {
        var bindingExpr = AssociatedObject.GetBindingExpression(TextBox.TextProperty);
        if(bindingExpr != null) bindingExpr.UpdateSource();
    }

    protected override void OnDetaching()
    {
        AssociatedObject.TextChanged -= AssociatedObjectOnTextChanged;
        base.OnDetaching();
    }
}

And the xaml is

<i:Interaction.Behaviors>

<NanoVM:AutoCommit/>

i:Interaction.Behaviors>

Another approach to solve this issue is to create TextBoxEx class drived from TextBox.With this approach the xaml size will be highly reduced as for each text box in your application it would save around 90 chars in xaml.

public class TextBoxEx : TextBox
{
    public TextBoxEx()
    {
        this.Loaded += new RoutedEventHandler(TextBoxEx_Loaded);
    }

    void TextBoxEx_Loaded(object sender, RoutedEventArgs e)
    {
        this.TextChanged += new TextChangedEventHandler(TextBoxEx_TextChanged);
    }

    void TextBoxEx_TextChanged(object sender, TextChangedEventArgs e)
    {
        var source = sender as TextBox;
        if (source != null)
        {
            var bindingExpression = source.GetBindingExpression(TextBox.TextProperty);
            if (bindingExpression != null)
            {
                bindingExpression.UpdateSource();
            }
        }
    }

}

and xaml in this case is

<ctrls:TextBoxEx Text=”{Binding SearchText,Mode=TwoWay}”/>

However the above behaviour give you more control of how text box behaves.

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Nano ViewModel Support

Rajneesh Noonia — Sun, 16 Jan 2011 17:18:33 +0000

Nano view model is very small library to build MVVM enabled Silverlight/WPF/WP7 based application.MVVM becomes more and more popular in fast few years and there are many implementations like MVVM Light toolkit, Prism(Last Version), nRoute, or Caliburn however these libraries have too many features and keep on growing which could have adverse effect on you project in terms of performance etc.For example communication between view in MVVM Light Toolkit is based on silverlight messaging which may not be best if you working ithin single silverlight application.It can be used when you page have more than one silverlight application (xap files) which requires communication and what about if you are not intead to use some of the feature from the toolkits i.e you want just the MVVM but you end up with adding complete set of library in your project.What if you need some features from MVVM Toolkit and you too want to use prism library.

There are a number of benefits this pattern brings to both WPF and Silverlight development. Before you go on, ask yourself:

Do you need to share a project with a designer, and have the flexibility for design work and development work to happen near-simultaneously?
Do you require thorough unit testing for your solutions?
Is it important for you to have reusable components, both within and across projects in your organization?
Would you like more flexibility to change your user interface without having to refactor other logic in the code base?

MVVM is not just about resuability,blendability & testability however its very power and if used properly you could create low latency WPF based applications.If you want to know about the theory you may follow the post here or google it and you will find many discussions and articles on MVVM.

Below are the features supported by NanoVmSupport library

Minimum code in you view model.
No nead to have obvervable properties and extra code with each property.
Supports command implementation.
Command binding for all most all controls using EventToCommand implementation
Provision to set design time data for view model (supports blendability)
NanoVmSupport.Events libaray supports communication between two view models in you application.It is extracted from Prism library so you if you are familiar with prism its very easy for your.Please note that you don’t have to use prism to use this.If few months later support you want prism, you may exclude NanoVmSupport.Events library and your code will start using eventing from prism with just chnaging single line of initilization.
You can easyly write unit tests against your view models.

The sample silverlight application below (MVVM & library MVVM.Events) is the implement of NanoVMSupport & NanoVMsupport.Events.The source code for sample project and NanoVMSupport library can be downloaded from here and if required binaries are here.

The sample folder in the source code also includes sample application code for silverlight and WPF.The WPF application is Auction Sniper for madbid which places your bids automaticaly based on some figures/process.
For communication between viewmodels check the documentation from prism or send me your queries in this post,for Microsoft Unity Application block click here.

MVVM common Issues & fixes in NanoVMSupport :

Standard Silverlight TextBox control is very useful but has one strange behavior: if you use TwoWay data binding and bind some property to controls Text property, when users type text into the control, this change is not propagated to the bound property until the control loses its focus. The AutoComit Behavior for textbox control is now part of NanoVMSupport Library (Lib for MVVM) for detail check this article “Silverlight TextBox AutoComit Behaviour“.
How to invalidate the CanExecute value : Suppose you have textbox and command button ,Can execute returns false if the length of text is zero otherwise it returns true and you have also used the above mentioned Auto Comit behaviour on text box.CanExecute will be re-evaluated when something interesting within the application’s window happens in WPF however in silverlight or with NanoVMSupport library you have to explictly update the ICommand.The one way of doing this is to change “RaisePropertyChange” method in ViewModelBase.cs as mentioned below
protected void RaisePropertyChanged(string name)
{
    PropertyChanged.Raise(this, name);
    PropertyChanged.Raise(this, "");

}

The code line PropertyChanged.Raise(this, “”); will refresh all the properties and icommands on view.But it may have performance issues if you have may properties and commands in viewmodal.The another recommended approach is to use following code in viewmodal

public string SelectedText
{
    get { return Get(() => SelectedText); }
    set
    {
        Set(() => SelectedText, value);
        base.RaisePropertyChanged("SearchCommand");
    }
}

The code base.RaisePropertyChanged(“SearchCommand”); will invalidate the SearchCommand.

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Silverlight Editors

Rajneesh Noonia — Fri, 14 Jan 2011 05:46:34 +0000

An early days experiment to create silverlight based shape editor control and rich text editor control ..

Shape editor : click on “Image” button, select image.you may drag,resize and change several properties of shapes.Some shapes like free hand drawing,text etc supports inline editing which will activate when you double click shape.

download shape editor source code

*Above control is just an experiment and may have buggs etc..

Word editor : experiment to Create RichTextBox ( silverlight based word) which allows basic text operations inclusing copy/past text etc to-from word,excel alone with formating and lot more..

*The code for this control was reflectored from Liquid RichTextBox and modified to incorporate other features. Liquid RichTextBox is free control to use in your application.

All these controls were created with silverlight 3 some were around 2009 and code may not to usefull as other new features are introduced with silverlight 4 which could be utilized in more efficient way.

Download RichTextBox source code

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Auction Sniper

Rajneesh Noonia — Wed, 05 Jan 2011 16:31:20 +0000

Auction Sniper is an eBay/Madbid sniper that automates the process of placing your eBay/madbid bid in the closing seconds of any eBay/Madbid bidding auction, dramatically increasing your chance of winning with huge saving to your bids.The sample application is WPF based windows application out of which as developer you will learn following tasks

NanoVMSupport Library for ViewModel (WPF & Silverlight).
Implementing MVVM in WPF.
Hooking web browser control for HTML events.

Source code of sample project is available within NanoVMSupport article. Launch the application and navigate to any open bids (single bid – detailed view) and click on start button.If you are not logged-in the application will ask you to log-in or press cancel if you just want to test this.

eBay implementation is not available in this project..

*Please note that this is just an proff of concept and is not intead to for end users.The code has been developed from developer prospective and fun.

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